Tire with thermoplastic innerliner

Patent metadata

Field	Value
Publication number	US-2016176232-A1
Application number	US-201514973883-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present invention is directed to a pneumatic tire comprising a carcass and an innerliner in direct contact with the carcass, the innerliner comprising: a film comprising a blend of a polyamide, an α-olefin graft copolymer, and an ionomer; and an adhesive layer disposed between the film and the carcass, the adhesive layer comprising: a polymeric amine and a resorcinol-formaldehyde-latex (RFL) adhesive. The invention is further directed to a method of building a pneumatic tire comprising the steps of: exposing an innerliner film to a corona discharge to create a corona treated film, the innerliner film comprising a blend of a polyamide, an α-olefin graft copolymer, and an ionomer; disposing a polymeric amine onto the corona treated film to create an amine treated film; disposing a resorcinol-formaldehyde-latex (RFL) adhesive on the amine treated film to create a treated innerliner film; and incorporating the treated innerliner film into a tire build such that the treated innerliner film is in direct contact with a tire carcass.

First claim

What is claimed is:

1 . A pneumatic tire comprising a carcass and an innerliner in direct contact with the carcass, the innerliner comprising:
a film comprising a blend of a polyamide, an α-olefin graft copolymer, and an ionomer; and an adhesive layer disposed between the film and the carcass, the adhesive layer comprising: a polymeric amine and a resorcinol-formaldehyde-latex (RFL) adhesive.

2 . The pneumatic tire of claim 1 , wherein the adhesive layer further comprises a polymethylmethacrylate-grafted natural rubber latex.

3 . The pneumatic tire of claim 1 , wherein the polyamide is selected from the group consisting of polyamide 6/66, polyamide 6, polyamide 66, polyamide 6/12, polyamide 6/10, polyamide 11, polyamide 12, and nylon-MXD6.

4 . The pneumatic tire of claim 1 , wherein the polyamide is polyamide 6/66.

5 . The pneumatic tire of claim 1 , wherein the α-olefin graft copolymer is derived from ethylene and a second α-olefin, and the α-olefin graft copolymer is grafted with an anhydride of an α, β-unsaturated carboxylic acid.

6 . The pneumatic tire of pneumatic tire of claim 1 , wherein the α-olefin graft copolymer is derived from ethylene and 1-octene, and the α-olefin graft copolymer is grafted with units derived from maleic anhydride.

7 . The pneumatic tire of claim 1 , wherein the ionomer is an at least partially neutralized salt of a copolymer derived from ethylene and an α, β-unsaturated monocarboxylic acid.

8 . The pneumatic tire of claim 1 , wherein the ionomer is an at least partially neutralized zinc salt of a copolymer derived from ethylene and methacrylic acid.

9 . The pneumatic tire of claim 1 , wherein the polymeric amine is a polyethylene imine.

10 . The pneumatic tire of claim 1 , wherein the RFL comprises a resorcinol-formaldehyde resin, a styrene-butadiene rubber, and a vinylpyridine-styrene-butadiene rubber.

11 . The pneumatic tire of claim 1 , wherein the blend comprises:
from 50 to 70 parts by weight of polyamide; from 10 to 30 parts by weight of the α-olefin graft copolymer; and from 10 to 30 parts by weight of the ionomer.

12 . The pneumatic tire of claim 1 , wherein the film has been exposed to a corona discharge.

13 . The pneumatic tire of claim 2 , wherein the film has been exposed to a corona discharge.

14 . A pneumatic tire comprising a carcass and an innerliner in direct contact with the carcass, the innerliner comprising:
a film comprising a blend of from 50 to 70 parts by weight of polyamide 6/66; from 10 to 30 parts by weight of an α-olefin graft copolymer derived from ethylene and 1-octene, and the α-olefin graft copolymer is grafted with units derived from maleic anhydride; and from 10 to 30 parts by weight of an ionomer comprising an at least partially neutralized zinc salt of a copolymer derived from ethylene and methacrylic acid; an adhesive layer disposed between the film and the carcass, the adhesive layer comprising: polyethylene imine and a resorcinol-formaldehyde-latex (RFL) adhesive.

15 . The pneumatic tire of claim 14 , where the adhesive layer further comprises a polymethylmethacrylate-grafted natural rubber.

16 . The pneumatic tire of claim 14 , wherein the film has been exposed to a corona discharge.

17 . The pneumatic tire of claim 15 , wherein the film has been exposed to a corona discharge.

18 . A method of building a pneumatic tire comprising the steps of:
exposing an innerliner film to a corona discharge to create a corona treated film, the innerliner film comprising a blend of a polyamide, an α-olefin graft copolymer, and an ionomer;
disposing a polymeric amine onto the corona treated film to create an amine treated film;
disposing a resorcinol-formaldehyde-latex (RFL) adhesive on the amine treated film to create a treated innerliner film; and
incorporating the treated innerliner film into a tire build such that the treated innerliner film is in direct contact with a tire carcass.

19 . The method of claim 14 , further comprising the step of disposing a polymethylmethacrylate-grafted natural rubber after disposing the RFL adhesive.

Assignees

• Goodyear Tire & Rubber

Inventors

• Brace Lauren Elizabeth
• Gillick James Gregory
• He Xiaojun

Classifications

• B60C5/14

  with impervious liner or coating on the inner wall of the tyre · CPC title

• B29D30/0005

  Pretreatment of tyres or parts thereof, e.g. preheating, irradiation, precuring · CPC title

• B60C1/0008 Primary

  Compositions of the inner liner · CPC title

• C08L77/02 Primary

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) · CPC title

• B60C5/00

  Inflatable pneumatic tyres or inner tubes (B60C1/00, B60C9/00 - B60C17/00 take precedence) · CPC title